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Resumen de Investigación
Analyzed using Evidence Intelligence™

Cognitive Behavioral Therapy Enhances Sleep and Lowers Blood Sugar in Diabetes

Desarrollado con el marco Evidence Intelligence™ de Dediabetes

Última actualización 16 de agosto de 2026

Key finding

The CBT group had 0.64 lower PSQI scores than the control group at 2 mo.

Cognitive behavioral therapy (CBT) improved sleep quality and reduced glycemic levels in patients with type 2 diabetes compared to usual care.

Quick read

Study at a glance

The essential study design details in one scan.

EvidenceScore™

Moderate

Study type

RCTs

Follow-up

Short-Term (≤3 mo)

Risk of bias

Some Concerns

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Plain-language summary

What this paper says

A plain-language read of the study’s main message and where it applies.

Study focus

Cognitive behavioral therapy (CBT) improved sleep quality and reduced glycemic levels in patients with type 2 diabetes compared to usual care.

Clinical relevance

Improving sleep quality and glycemic control is crucial for managing type 2 diabetes. This study suggests that integrating cognitive behavioral therapy into standard care could lead to better health outcomes for patients, potentially reducing the risk of diabetes-related complications.

Keep in mind

Unclear effectiveness for some outcomes. Limited generalizability due to specific population characteristics. Potential confounding factors not accounted for.

Published in

Referencia de la Revista

Publication details and source links for this paper.

Huai-Zhong Z, Pan Z, Gui-Qiu C, et al. Cognitive behavioral therapy improves sleep quality and reduces glycemic levels in patients with type 2 diabetes mellitus. World Journal of Diabetes. 2021;12(3):292-305. doi:10.4239/wjd.v12.i3.292

View DOIView on PubMedView on PMC

Efectos Principales

CBT group had a 0.64 lower PSQI score at 2 months compared to usual care (p=0.01).

CBT group showed a 0.17% lower HbA1c value at 6 months compared to usual care (p=0.02).

CBT group maintained lower PSQI scores at 6 and 12 months compared to the control group.

Control group had higher HbA1c values compared to the CBT group at both 6 and 12 months.

Evidence network

How this study fits

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Evidence Context

This study contributes evidence to Usual care and HbA1c, Sleep quality.

This study contributes evidence to

Intervention

Usual care

Outcome

HbA1c

Evidence topic

HbA1c Reduction

Primary intervention

Usual care

Primary outcomes

  • HbA1c
  • Sleep quality

Evidence topics

HbA1c Reduction

Primary intervention

Usual care

Primary outcomes

HbA1cSleep quality

Evidence relationships

Intervention and outcome relationships this study adds to the evidence network.

2
Evidence pairs
2
Relationships
1
Evidence topics
contributes_evidence

Editorial context

Why this study matters

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Evidence network role

This section describes how the study fits into the current evidence network. It does not determine whether an intervention works on its own.

Moderate contributionModerate confidenceNetwork score: 51

1

Related topics

2

Evidence pairs

391

Related studies

High relevance in at least one topic

Why it is useful

  • Contributes to 2 evidence relationships
  • Includes primary outcome data
  • Linked to 1 direct semantic evidence topic

Topic contributions

Evidence topic

Contributes evidence

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Evidencia principal

Tema de evidencia

HbA1c Reduction

matched_outcome

Core evidence

Study findings

The primary outcomes reported in this study.

HbA1c

Usual care → HbA1c

Usual care → HbA1c

Evidence Intelligence™
EvidenceScore™
86
Strong
ImpactScore™
59
Slightly Positive
ConsistencyScore™
90
consistent
Estudios de apoyo: Basado en 11 estudios
Add to Evidence Tracker

Sleep quality

Usual care → Sleep quality

Usual care → Sleep quality

Evidence Intelligence™
EvidenceScore™
Emerging
Score 59 · Based on 1 study
ImpactScore™
100
Very Positive
ConsistencyScore™
unclear
Not enough independent studies
Estudios de apoyo: Basado en 1 estudio
Add to Evidence Tracker

Evidence Library

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evidence suggest

La Evidencia Sugiere

  • CBT reduced PSQI scores by 0.64 at 2 months, indicating improved sleep quality.
  • CBT lowered HbA1c levels by 0.17% at 6 months, suggesting better glycemic control.
  • Control group consistently had higher PSQI and HbA1c values than CBT group.
who this applies

A quién se aplica

  • Adults diagnosed with type 2 diabetes mellitus.
  • Patients experiencing sleep disturbances related to diabetes.
keep in mind

Tener en Cuenta

  • Results may not apply to all demographics or diabetes types.
  • Further research needed to confirm long-term benefits of CBT.
  • Study design limitations may affect the interpretation of results.
between the lines

Entre Líneas

  • Unclear effectiveness for some outcomes.
  • Limited generalizability due to specific population characteristics.
  • Potential confounding factors not accounted for.

Evidence Library

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Connected Evidence

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Relationships organized using the Dediabetes Evidence Intelligence™ framework.

Desarrollado con el marco Evidence Intelligence™ de Dediabetes

This study contributes to evidence on Usual care and HbA1c, Usual care and Quality of Life Outcomes.

Relaciones de evidencia relacionadas

Explore in Evidence Explorer

This study contributes to the evidence on the following intervention-outcome relationships.

Questions answered by this study

Generated from the study's connected evidence using Evidence Intelligence™.

Does Usual care improve HbA1c?

Strong Evidence

Usual care may improve HbA1c.

ConsistencyScore™: Results are consistent across studies.

Ranked evidence signals

  1. 1

    HbA1c

    EvidenceScore™ Strong | EvidenceScore™ 85.9 | weak positive | ConsistencyScore™ Consistent | 1 study

Why this answer: This answer is based on a single supporting study.

Limitations

  • Only one supporting study is available.
  • Population details are unavailable.
1 supporting studyUpdated: Aug 2026
View Full Evidence

Does Usual care improve sleep quality?

Emerging Evidence

Usual care appears to improve Sleep quality.

ConsistencyScore™: Consistency cannot yet be determined from the available evidence.

Ranked evidence signals

  1. 1

    Sleep quality

    EvidenceScore™ Emerging | EvidenceScore™ 59.0 | strong positive | ConsistencyScore™ Unclear | 1 study

Why this answer: This answer is based on a single supporting study.

Limitations

  • Only one supporting study is available.
  • Consistency cannot yet be determined.
  • Population details are unavailable.
1 supporting studyUpdated: Aug 2026
View Full Evidence
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Next steps

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Evidence topics

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HbA1c Reduction Evidence Hub

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All studies on Usual care and HbA1cAll studies on Usual care and Sleep quality

Related research

Read related research summaries.

Educational intervention improves glycemic control in type 2 diabetes patientsQCC Model Enhances Diabetes ManagementDigital intervention improves glycemic control in type 2 diabetes patientsMusic Therapy Improves Cognition and Quality of Life in Diabetic ElderlyTelemonitoring improves glycemic control in pediatric diabetes

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